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buffer: added support for writing NaN and Infinity

to writeDoubleBE(), writeDoubleLE(), writeFloatBE() and writeFloatLE().
Fixes #3934.
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koichik committed Sep 1, 2012
1 parent 870307d commit 7f404e3509ecd349843eab7a3d16ad616e20c6e9
Showing with 109 additions and 3 deletions.
  1. +7 −3 lib/buffer.js
  2. +63 −0 test/simple/test-writedouble.js
  3. +39 −0 test/simple/test-writefloat.js
@@ -1025,10 +1025,14 @@ function verifsint(value, max, min) {
assert.ok(Math.floor(value) === value, 'value has a fractional component');
}

function verifIEEE754(value, max, min) {
function verifyIEEE754(value, max, min) {
assert.ok(typeof (value) == 'number',
'cannot write a non-number as a number');

if (isNaN(value) || value === Infinity || value === -Infinity) {
return;
}

assert.ok(value <= max, 'value larger than maximum allowed value');

assert.ok(value >= min, 'value smaller than minimum allowed value');
@@ -1135,7 +1139,7 @@ function writeFloat(buffer, value, offset, isBigEndian, noAssert) {
assert.ok(offset + 3 < buffer.length,
'Trying to write beyond buffer length');

verifIEEE754(value, 3.4028234663852886e+38, -3.4028234663852886e+38);
verifyIEEE754(value, 3.4028234663852886e+38, -3.4028234663852886e+38);
}

require('buffer_ieee754').writeIEEE754(buffer, value, offset, isBigEndian,
@@ -1164,7 +1168,7 @@ function writeDouble(buffer, value, offset, isBigEndian, noAssert) {
assert.ok(offset + 7 < buffer.length,
'Trying to write beyond buffer length');

verifIEEE754(value, 1.7976931348623157E+308, -1.7976931348623157E+308);
verifyIEEE754(value, 1.7976931348623157E+308, -1.7976931348623157E+308);
}

require('buffer_ieee754').writeIEEE754(buffer, value, offset, isBigEndian,
@@ -123,6 +123,69 @@ function test(clazz) {
ASSERT.equal(0x00, buffer[13]);
ASSERT.equal(0x00, buffer[14]);
ASSERT.equal(0x80, buffer[15]);

buffer.writeDoubleBE(Infinity, 0);
buffer.writeDoubleLE(Infinity, 8);
ASSERT.equal(0x7F, buffer[0]);
ASSERT.equal(0xF0, buffer[1]);
ASSERT.equal(0x00, buffer[2]);
ASSERT.equal(0x00, buffer[3]);
ASSERT.equal(0x00, buffer[4]);
ASSERT.equal(0x00, buffer[5]);
ASSERT.equal(0x00, buffer[6]);
ASSERT.equal(0x00, buffer[7]);
ASSERT.equal(0x00, buffer[8]);
ASSERT.equal(0x00, buffer[9]);
ASSERT.equal(0x00, buffer[10]);
ASSERT.equal(0x00, buffer[11]);
ASSERT.equal(0x00, buffer[12]);
ASSERT.equal(0x00, buffer[13]);
ASSERT.equal(0xF0, buffer[14]);
ASSERT.equal(0x7F, buffer[15]);
ASSERT.equal(Infinity, buffer.readDoubleBE(0));
ASSERT.equal(Infinity, buffer.readDoubleLE(8));

buffer.writeDoubleBE(-Infinity, 0);
buffer.writeDoubleLE(-Infinity, 8);
ASSERT.equal(0xFF, buffer[0]);
ASSERT.equal(0xF0, buffer[1]);
ASSERT.equal(0x00, buffer[2]);
ASSERT.equal(0x00, buffer[3]);
ASSERT.equal(0x00, buffer[4]);
ASSERT.equal(0x00, buffer[5]);
ASSERT.equal(0x00, buffer[6]);
ASSERT.equal(0x00, buffer[7]);
ASSERT.equal(0x00, buffer[8]);
ASSERT.equal(0x00, buffer[9]);
ASSERT.equal(0x00, buffer[10]);
ASSERT.equal(0x00, buffer[11]);
ASSERT.equal(0x00, buffer[12]);
ASSERT.equal(0x00, buffer[13]);
ASSERT.equal(0xF0, buffer[14]);
ASSERT.equal(0xFF, buffer[15]);
ASSERT.equal(-Infinity, buffer.readDoubleBE(0));
ASSERT.equal(-Infinity, buffer.readDoubleLE(8));

buffer.writeDoubleBE(NaN, 0);
buffer.writeDoubleLE(NaN, 8);
ASSERT.equal(0x7F, buffer[0]);
ASSERT.equal(0xF0, buffer[1]);
ASSERT.equal(0x00, buffer[2]);
ASSERT.equal(0x00, buffer[3]);
ASSERT.equal(0x00, buffer[4]);
ASSERT.equal(0x00, buffer[5]);
ASSERT.equal(0x00, buffer[6]);
ASSERT.equal(0x01, buffer[7]);
ASSERT.equal(0x01, buffer[8]);
ASSERT.equal(0x00, buffer[9]);
ASSERT.equal(0x00, buffer[10]);
ASSERT.equal(0x00, buffer[11]);
ASSERT.equal(0x00, buffer[12]);
ASSERT.equal(0x00, buffer[13]);
ASSERT.equal(0xF0, buffer[14]);
ASSERT.equal(0x7F, buffer[15]);
ASSERT.ok(isNaN(buffer.readDoubleBE(0)));
ASSERT.ok(isNaN(buffer.readDoubleLE(8)));
}


@@ -83,6 +83,45 @@ function test(clazz) {
ASSERT.equal(0x00, buffer[5]);
ASSERT.equal(0x00, buffer[6]);
ASSERT.equal(0x80, buffer[7]);

buffer.writeFloatBE(Infinity, 0);
buffer.writeFloatLE(Infinity, 4);
ASSERT.equal(0x7F, buffer[0]);
ASSERT.equal(0x80, buffer[1]);
ASSERT.equal(0x00, buffer[2]);
ASSERT.equal(0x00, buffer[3]);
ASSERT.equal(0x00, buffer[4]);
ASSERT.equal(0x00, buffer[5]);
ASSERT.equal(0x80, buffer[6]);
ASSERT.equal(0x7F, buffer[7]);
ASSERT.equal(Infinity, buffer.readFloatBE(0));
ASSERT.equal(Infinity, buffer.readFloatLE(4));

buffer.writeFloatBE(-Infinity, 0);
buffer.writeFloatLE(-Infinity, 4);
ASSERT.equal(0xFF, buffer[0]);
ASSERT.equal(0x80, buffer[1]);
ASSERT.equal(0x00, buffer[2]);
ASSERT.equal(0x00, buffer[3]);
ASSERT.equal(0x00, buffer[4]);
ASSERT.equal(0x00, buffer[5]);
ASSERT.equal(0x80, buffer[6]);
ASSERT.equal(0xFF, buffer[7]);
ASSERT.equal(-Infinity, buffer.readFloatBE(0));
ASSERT.equal(-Infinity, buffer.readFloatLE(4));

buffer.writeFloatBE(NaN, 0);
buffer.writeFloatLE(NaN, 4);
ASSERT.equal(0x7F, buffer[0]);
ASSERT.equal(0x80, buffer[1]);
ASSERT.equal(0x00, buffer[2]);
ASSERT.equal(0x01, buffer[3]);
ASSERT.equal(0x01, buffer[4]);
ASSERT.equal(0x00, buffer[5]);
ASSERT.equal(0x80, buffer[6]);
ASSERT.equal(0x7F, buffer[7]);
ASSERT.ok(isNaN(buffer.readFloatBE(0)));
ASSERT.ok(isNaN(buffer.readFloatLE(4)));
}


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